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October rose care: How to make the season last

October brings out the orange (plus bronze foliage) of this
floribunda rose. (Photos: Debbie Arrington)

Tips to keep your bushes thriving and blooming

It's not only foliage that turns color in fall.

October roses look different. Reds seem darker, orange and yellow hues more intense. Light-colored or white petals tend to brown prematurely or bear the tiny tracks of hungry thrips. Leaves may turn burnished bronze, show signs of fungal damage or look ready to fall off. Bright red or orange hips -- rose fruit -- start to form.

These differences make fall rose care different, too. With Sacramento's mild autumn weather, there's still time to enjoy more flowers. But the bushes need a little extra TLC and observation to make the most of the final weeks of this growing season.

* October is when fungal diseases and certain pests tend to show up (again). It's the weather; those afternoons in the 70s and morning dew combine for optimal conditions. Blackspot and rust are the most common fungal problems and will basically defoliate the bush. (You want the plant to lose its leaves, but not until late December and pruning time.) Blackspot starts as yellow blotches, then lives up to its name; also aptly named, rust is the orange spores found on the underside of leaves.

Don't spray fungicide after seeing an outbreak; it's pretty much useless at this stage.
The best strategy is to contain these outbreaks before they spread. This also cuts down on outbreaks next spring. If you see an infected leaf, snip off the whole leaflet and dispose of it in the garbage (not in green waste or compost; that just spreads the fungus). If you see fallen leaves under your rose bushes, pick them up and dispose of them, too. These fungi lurk in fallen foliage and old mulch, awaiting new leaves and spring.
Gemini hybrid rose looks redder in fall weather.

* Also be on the look out for spider mites; they love dry and dusty conditions. Strong blasts of water will clean the foliage and drown many mites.

* Aphids will attack new foliage and buds as bushes push out one last round of flowers. (They've been especially bad in my garden this month.) Blast them off with water, too, or squirt with insecticidal soap.

* Western flower thrips, which feed on petals before the buds open, cause scarring that's most notable on light-colored roses, especially white or cream blooms. Infected buds may look deformed; trim them off and dispose of them. (Winter weather will eventually take care of the other thrips.)

* Dead-head spent blooms, but avoid any hard pruning just yet. (Save that for winter dormancy.) Hybrid tea roses pruned now should rebloom in six to eight weeks, in time for Thanksgiving and December bouquets.

* Rose hips add color and interest to the fall garden, but delay them on most varieties until November. When rose hips form at the base of old blooms, that cues the bush that its work is over and it can go to sleep for the winter. When you delay hip formation, the bush continues to produce flowers.
The Mardi Gras floribunda rose shows all its colors in fall.

* Remove browned roses or buds that refuse to open. Pick up browned blooms, too. Those discolored flowers often are infected with botrytis (good for wine grapes, bad for roses).

* Although you want more flowers, cut back on any fertilizer, especially nitrogen. (That prompts too much new growth.) Sprinkle a little bone meal instead.

* What the roses do need is water. October precipitation usually is not enough. Check that the bushes are getting the irrigation they need (about an inch a week).

* Windy weather can be a problem for climbing and tall roses, which can get whipped around by strong gusts. Tie down new canes to avoid wind damage.

* While outdoors checking your roses, remember to bring some blooms inside. With their rich colors, fall roses are among the prettiest of the year.


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Garden Checklist for week of July 7

Take care of garden chores early in the morning, concentrating on watering. We’re still in survival mode until this heat wave breaks.

* Keep your vegetable garden watered, mulched and weeded. Water before 8 a.m. to conserve moisture.

* Prevent sunburn; provide temporary shade for tomatoes, peppers, eggplant, melons, squash and other crops with “sensitive” skin.

* Hold off on feeding plants until temperatures cool back down to “normal” range. That means daytime highs in the low to mid 90s.

* Don’t let tomatoes wilt or dry out completely. Give tomatoes a deep watering two to three times a week. Harvest vegetables promptly to encourage plants to produce more.

* Squash especially tends to grow rapidly in hot weather. Keep an eye on zucchini.

* Some weeds thrive in hot weather. Whack them before they go to seed.

* Pinch back chrysanthemums for bushy plants and more flowers in September.

* Harvest tomatoes, squash, peppers and eggplant. Prompt picking will help keep plants producing.

* Remove spent flowers from roses, daylilies and other bloomers as they finish flowering.

* Pinch off blooms from basil so the plant will grow more leaves.

* Cut back lavender after flowering to promote a second bloom.

* One good thing about hot days: Most lawns stop growing when temperatures top 95 degrees. Keep mower blades set on high.

* Once the weather cools down a little, it’s not too late to add a splash of color. Plant petunias, snapdragons, zinnias and marigolds.

* After the heat wave, plant corn, pumpkins, radishes, winter squash and sunflowers. Make sure the seeds stay hydrated.

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